MAX3243ECWI RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX3243ECWI is a full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, designed for serial communication applications requiring 3 drivers and 5 receivers in a 28-SOIC surface mount package. The device operates across a 3V to 5.5V supply range with a 250 kbps data rate and 300 mV receiver hysteresis. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production support and design continuity.

Substiute Parts

MAX3243ECWI

Analog Devices Inc./Maxim IntegratedIn Stock: 2412MAX3243ECWI Datasheet

Current PartRFQ

MAX3243ECWI+

Analog Devices Inc./Maxim IntegratedIn Stock: 2403MAX3243ECWI+ Datasheet

Parametric EquivalentRFQ

MAX3243ECDW

Texas InstrumentsIn Stock: 1282MAX3243ECDW Datasheet

DirectRFQ

ICL3243CBZ

Renesas Electronics CorporationIn Stock: 1122ICL3243CBZ Datasheet

Parametric EquivalentRFQ

MAX3243CDW

Texas InstrumentsIn Stock: 997MAX3243CDW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX3243ECWI is determined by strict equivalence across the following critical parameters:

• Protocol: RS232
• Number of Drivers/Receivers: 3/5
• Duplex: Full
• Package / Case: 28-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount
• Voltage - Supply: 3V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C

Substitute parts are grouped into two categories:

Parametric Equivalents maintain all critical electrical and mechanical parameters, including data rate (250 kbps) and receiver hysteresis (300 mV). These parts are direct functional replacements.

Direct Manufacturer Alternatives may exhibit variations in secondary parameters such as data rate or receiver hysteresis while maintaining the core 3/5 transceiver configuration and package specification. These parts require engineering evaluation for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

MAX3243ECWI+ (Parametric Equivalent - Recommended Primary Substitute)

The MAX3243ECWI+ is the preferred substitute for the obsolete MAX3243ECWI. It maintains identical electrical specifications including 250 kbps data rate and 300 mV receiver hysteresis. The part is currently in active production status and achieves ROHS3 compliance, addressing regulatory requirements for new designs. Packaging is identical at 28-SOIC. This part represents a direct functional replacement with no design modifications required.

ICL3243CBZ (Parametric Equivalent - Alternative Substitute)

The ICL3243CBZ from Renesas Electronics Corporation provides full parametric equivalence with matching data rate and receiver hysteresis specifications. The part is in active production status and ROHS3 compliant. Moisture sensitivity level is rated at MSL 3 (168 Hours), requiring controlled storage and handling procedures compared to the MSL 1 rating of other alternatives. This part is suitable for applications where Renesas device qualification is required.

MAX3243ECDW (Direct Manufacturer Alternative - Secondary Option)

The MAX3243ECDW from Texas Instruments maintains the core 3/5 transceiver configuration and 28-SOIC package. However, this part exhibits enhanced specifications with 500 kbps data rate and 500 mV receiver hysteresis compared to the original 250 kbps and 300 mV. The part is classified as Last Time Buy, indicating limited future availability. Use this part only when enhanced performance parameters are compatible with application requirements.

MAX3243CDW (Parametric Equivalent - Legacy Option)

The MAX3243CDW provides parametric equivalence with matching 250 kbps data rate and 300 mV receiver hysteresis. The part is classified as obsolete, limiting its suitability for new production designs. ROHS3 compliance is achieved. This part is suitable only for legacy system maintenance where existing inventory exists.

Frequently Asked Questions (FAQ)

Q: Can MAX3243ECWI+ be used as a direct replacement for MAX3243ECWI without PCB modifications?

A: Yes. The MAX3243ECWI+ maintains identical pin configuration, package dimensions (28-SOIC), and electrical specifications. No PCB layout changes are required for substitution.

Q: What is the primary difference between MAX3243ECWI and MAX3243ECDW?

A: The MAX3243ECDW operates at 500 kbps data rate with 500 mV receiver hysteresis, compared to the MAX3243ECWI specifications of 250 kbps and 300 mV. Both maintain the 3/5 transceiver configuration and 28-SOIC package. Application requirements determine compatibility.

Q: Is ICL3243CBZ suitable for applications requiring unlimited moisture exposure?

A: No. The ICL3243CBZ is rated MSL 3 (168 Hours), requiring controlled storage and handling. Applications requiring unlimited moisture tolerance should use MAX3243ECWI+, MAX3243ECDW, or MAX3243CDW, all rated MSL 1.

Q: Why is MAX3243ECWI classified as obsolete?

A: The MAX3243ECWI has reached end-of-life status. The MAX3243ECWI+ is the active production equivalent from the same manufacturer, providing continued design support and supply continuity.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed (MAX3243ECWI+, MAX3243ECDW, ICL3243CBZ, MAX3243CDW) achieve ROHS3 compliance. The original MAX3243ECWI is RoHS non-compliant.

Q: Can MAX3243ECDW be used in applications designed for MAX3243ECWI?

A: Substitution requires engineering evaluation. The MAX3243ECDW provides enhanced performance (500 kbps vs. 250 kbps, 500 mV vs. 300 mV hysteresis). Applications designed for the lower specifications will operate correctly with the higher-performance part, but the reverse substitution is not valid.